* lisp/tab-bar.el: Use autoloaded seq-position.

* lisp/tab-bar.el (tab-bar--current-tab-index)
(tab-bar--tab-index, tab-bar--tab-index-by-name):
Use seq-position.

(tab-bar-select-tab, tab-bar-new-tab, tab-bar-close-tab)
(tab-bar-close-other-tabs, tab-bar-rename-tab)
(tab-bar-list-execute): Call force-mode-line-update
unconditionally independent from tab-bar-mode.

(tab-bar-rename-tab, tab-bar-rename-tab-by-name):
Use read-from-minibuffer instead of read-string
to be able to enter empty string.
1 job for master in 81 minutes and 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #3915
test-all

01:21:24

 
Name Stage Failure
failed
test-all Test
Makefile:319: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
Makefile:294: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1